package NC25_删除有序链表中重复的元素1;

class ListNode {
    int val;
    ListNode next = null;

    public ListNode(int val) {
        this.val = val;
        this.next = null;
    }
}

public class Solution {
    /**
     *
     * @param head ListNode类
     * @return ListNode类
     */
    public ListNode deleteDuplicates (ListNode head) {
        // write code here
        if (head == null){
            return null;
        }
        ListNode cur = head;
        while (cur.next != null) {
            if (cur.val == cur.next.val) {
                cur.next = cur.next.next;
            } else {
                cur = cur.next;
            }
        }
        return head;
    }
}